76391507820 has 48 divisors (see below), whose sum is σ = 214090329600. Its totient is φ = 20352582336.

The previous prime is 76391507813. The next prime is 76391507849. The reversal of 76391507820 is 2870519367.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 76391507820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510970 + ... + 643329.

It is an arithmetic number, because the mean of its divisors is an integer number (4460215200).

Almost surely, 2^76391507820 is an apocalyptic number.

It is an amenable number.

76391507820 is an abundant number, since it is smaller than the sum of its proper divisors (137698821780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

76391507820 is a wasteful number, since it uses less digits than its factorization.

76391507820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155414 (or 1155412 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The spelling of 76391507820 in words is "seventy-six billion, three hundred ninety-one million, five hundred seven thousand, eight hundred twenty".